A Demon Guardian?

Some time ago I noticed something wrong. I had a strange feeling every night in my room. I thought it might just be simple fear, since people fear the dark naturally, but it wasn't.

Throughout each night I sat up and tried to focus and find out what was making me so unnerved. I took notice that every night my dogs would growl and bark when ever I got this strange feeling. I had heard somewhere that animals can either sense, or see what we cannot.

I kept looking into it and came to the conclusion that it may be a demon. I tried to command it, if it was a demon, to go in my tree outside. Instantly the leafs rustled. I got a sensation of excitement and fear at this discovery.

Throughout nights I tested it and tried to prove to myself it was indeed a demon. Then one day I went to the park with my girlfriend, Sara. As I was sitting down at a bench I saw a cat and I got the same feeling as I had gotten in my room from the cat. The cat came up to me and sat on my lap. I told Sara what I thought this cat might be and she was skeptical. She was petting it and as another test to prove, I mentally told it to bite at her hand. It then bit at her hand and retreated back to my lap. She then told me she also told it to bite at her hand if it was a demon.

She told me to command it to leave, but I was so intrigued by it I couldn't. After a while I told it to leave and it did. Sara then touched my hand because she wanted to hold hands but it burnt when she touched me. From then on I would go to the park every so often and call it mentally and it always came. A sense came over me telling me that this was my guardian, that it was once a very powerful angel that had fallen.

I'm sorry if this sounds totally unbelievable but everything I said is true. My questions are: Why did Sara burn me when she touched my hand? Why is this demon (or whatever it is) following me? And why did it say it was my guardian?